8. They say something meaningful, such as “I found a long hair in your room,” and watch his reaction.
“When I try and lead him on to the truth, I can see it in his eyes.” A lot of girls said they’d use the fact that their boyfriend isn’t a good liar to get him to admit to the affair. If you don’t want him to know you suspect something, it could be even more effective to act casual and observe how he reacts when he thinks you’re not looking.